Mailing issues

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Hi

On my webpage, I have some scripts that automatically mail notifications when new entries are published (such as in the guestbook, registrations and for forgotten passwords). However, even if the mails are sent (I have a php function to verify this), they do not appear in the mailboxes!!!

I have noticed that mails which are sent to a @gmail.com address arrive more often than mails sent to @hotmail.com addresses, which tend to not arrive at all. Your mail server is on the safe list in both my accounts...

Could you please advice?

I guess I have the intermediate level of php, ad-free account on stoli.